Question

Which of the following is an incorrect name according to $IUPAC$ ?

• A. $2$-Cyclopropyl butane
• B. Cyclohexyl cyclohexane
• C. 1-bromo-2 , 2 -dichloro cyclobutane
• D. 1-cyclobutyl cyclobutane

Answer 1

Answer: (C)

Here, the parent ring is wrongly numbered

2-bromo-1, 1-dichlorocyclobutane
Correct number series: $1,1,2$
Wrong number series: $1,2,2$
(lower number coming at first occasion of difference is the correct number series)